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Intangible Assets | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets consists of the following:
| September 30, 2025 |  | December 31, 2024
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Acquired intangible assets | $ | 1,087 |  |  | $ | (978) |  |  | $ | 109 |  |  | $ | 1,087 |  |  | $ | (962) |  |  | $ | 125 |
Patents and licenses | 14 |  |  | (9) |  |  | 5 |  |  | 14 |  |  | (7) |  |  | 7 |
Total intangible assets | $ | 1,101 |  |  | $ | (987) |  |  | $ | 114 |  |  | $ | 1,101 |  |  | $ | (969) |  |  | $ | 132 |
Amortization expense related to acquired intangible assets was $5 million and $16 million for the three and nine months ended September 30, 2025, respectively, and $6 million and $17 million for the three and nine months ended September 30, 2024, respectively.

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